When one of Gotham's former heroes returns to his old stomping grounds to settle a score, both Batwoman and Commander Kane find themselves on the defensive. Meanwhile, Alice has uncovered what could finally take down Batwoman, but she is losing hold on her henchman Mouse and Hush, sending her spiraling into her most wicked self. Luke immediately focuses on finding a way to protect Batwoman from Alice, and Mary has a chance to be the sister Kate has needed all along. New information surfaces, forcing Julia to warn Sophie about the person pulling the strings. And in a final standoff, when Commander Kane refuses to retreat from his war on Batwoman, Kate may find herself more than heartbroken by her father’s choices.
When members of Gotham's intelligentsia begin disappearing, Commander Kane, Sophie and the Crows go searching for the newest homicidal threat to the city. In the meantime, Kate is consumed with someone’s betrayal and starts questioning the loyalty of everyone around her just when she needs them most. So when Luke and Julia go missing, Batwoman must rely on Mary and a former foe to deploy her rescue mission. Meanwhile, Alice enlists Tommy Elliot to help acquire an elusive item that her sister also seeks.
Batwoman enlists Luke and Julia for an undercover mission to recover one of the most important items from her cousin’s arsenal. While Alice continues developing her devious plans within Arkham’s walls, she gets an unexpected visit from Jacob Kane who needs her help. Meanwhile, Mary tries to prove herself to Kate. As Sophie gets closer to a co-worker, Kate reunites with an old flame.
While Gotham busies itself reacting to Batwoman’s awkward encounter, Alice celebrates her ultimate act of vengeance with Mouse. A devastated Mary focuses on Jacob Kane’s trial, while Sophie seeks advice about her love life from someone unexpected. As they tackle the newest threat to Gotham, Luke prioritizes protecting Batwoman’s secret, and Kate must decide what she is willing to do to honor Batwoman’s identity...and her own.
The group uses Ray's invention to track new recruits to help save the universe. The Monitor sends Iris, Clark and Lois in search of a mysterious Kryptonian, while Kate and Kara head out to find Bruce Wayne. In addition, Mia challenges Sara, Rory discovers a hidden talent, and Lex Luthor returns. This crossover begins on Supergirl S5E09, and continues on The Flash S6E09, Arrow S8E08, and Legends of Tomorrow S05E01.
Kate and Sophie must reconcile with their past as Kate questions just how much she can trust her former lover. Kate and Luke have an encounter with an old friend. Mary grapples with the fate of the Kane family as Catherine seeks Jacob's help. Alice and a new cohort are in on yet another nefarious plan, but her motives are more than they seem.
A disturbing death has Gotham reeling and the city reaches out for their new vigilante hero. Luke confides in Kate, while Sophie asks Jacob for a special assignment. Alice continues her nefarious plot against the Kanes, with Catherine being a conduit to part of her plan. Batwoman pays another visit to Mary.